Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8f718a58228e71fd3a7a230d384fa96550a6a38bf0cd9574dac03b29cb3d41' 
  AND token = '257CcT98lvBzE1A5f99flgFSK4HgHGKV1OVBzjLI1Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}